EP2398110A1 - Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques - Google Patents

Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques Download PDF

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Publication number
EP2398110A1
EP2398110A1 EP10006354A EP10006354A EP2398110A1 EP 2398110 A1 EP2398110 A1 EP 2398110A1 EP 10006354 A EP10006354 A EP 10006354A EP 10006354 A EP10006354 A EP 10006354A EP 2398110 A1 EP2398110 A1 EP 2398110A1
Authority
EP
European Patent Office
Prior art keywords
damping layer
metallic surface
layer
damping
electromagnetic wave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10006354A
Other languages
German (de)
English (en)
Inventor
Gerhard RÖTTER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP10006354A priority Critical patent/EP2398110A1/fr
Publication of EP2398110A1 publication Critical patent/EP2398110A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/528—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the re-radiation of a support structure

Definitions

  • the invention relates to a damping layer for reducing the reflection of electromagnetic waves according to the preamble of patent claim 1, and the use of such a damping layer for RFID applications in the UHF range according to claim 12.
  • RFID Radio Frequency Identification
  • the areas with the described minima, in which interference occurs are not stationary and can hardly be predetermined and thus avoided.
  • the wavelength of the signal is small relative to the detection range or radius of conventional RFID readers, so that a multiplicity of local minima can occur in a conventional arrangement.
  • radio technology numerous approaches are known in order to reduce the problems that arise as a result of the minima generated by reflection and scattering and the interference occurring there.
  • directional antennas can be used, multiple or different radio channels can be used simultaneously ("frequency diversity"), readers with multiple antennas can be used (“antenna diversity”), multiple detection attempts can be made one after the other (in particular in the case of moving antennas) Labels and / or readers) etc.
  • frequency diversity multiple or different radio channels can be used simultaneously
  • readers with multiple antennas can be used
  • detector attempts can be made one after the other (in particular in the case of moving antennas) Labels and / or readers) etc.
  • absorbers From measuring technology for electromagnetic compatibility (EMC) so-called “absorbers” are known, with which in particular the measuring stations (measuring chambers) are often equipped for EMC measurements. These absorbers are often made of ferrite-containing plates, which are in the form of wedges (in a similar geometry as the known from the acoustic measuring chambers wall panels) and reflect as little as possible of the incident wave components and also scatter the still reflected components such that it at least no pronounced local minima and maxima exist. However, these absorbers are expensive and moreover, due to their geometry and weight, they can hardly be used in practice in an industrial environment.
  • volume conductive plastics especially volume conductive propylene or polypropylene, especially is suitable for covering metallic surfaces (surfaces) and thus significantly reducing the reflected portion of an electromagnetic wave in the UHF range.
  • Volume-conductive plastic or volume-conductive propylene or polypropylene is used in the semiconductor industry for the packaging of electrostatically sensitive components, because charge carriers are derived by the surface electrical resistance of these materials. Due to the multiple use in the semiconductor industry, the volume conductive plastics - compared to the known ferrite-based absorbers - are available at low cost. It is even conceivable that the packaging materials used in large quantities in the semiconductor industry can be recycled to form an insulating layer according to the invention, which may result in economic and ecological advantages.
  • a damping layer for reducing the reflection of electromagnetic waves is proposed on metallic surfaces, which is upstream of the metallic surface and consists essentially of volume-conductive plastic.
  • conductive plastics are a practical and inexpensive alternative to the known absorber materials because of their low mass, ease of processing, and chemical resistance to a variety of lubricants and other environmental influences.
  • a particularly advantageous use of the damping layer according to the invention in the environment of RFID applications in the UHF range is given.
  • a particularly good processability of the damping layer results when as the plastic is a propylene or polypropylene is used. Because of the multiple use of propylene or polypropylene as a base material for the volume-conductive packaging materials in the semiconductor sector, the propylene or polypropylene-based film and bulk plastics are also an economically interesting alternative.
  • a first distance is provided between the damping layer and the metallic surface. If this distance is chosen as a function of the wavelength and the expected angle of incidence or the angle of the electromagnetic wave, in addition to the absorbing effect of the damping layer, at least partial extinction of the (attenuated) reflected signal component can be effected so that, depending on the considered angle almost complete damping can be achieved.
  • a number of spacers can advantageously be used, which can be mounted in an advantageous embodiment already in the production of the damping layer on this or on the metallic surface.
  • the damping layer consists of a plurality of individual layers of the volume-conductive plastic, wherein in further advantageous embodiments between these individual layers in turn second distances and possibly spacers or other constructive measures can be provided.
  • the angular dependence of the damping effect can be reduced and the attenuation can be increased and an effect in a wider frequency range can be achieved.
  • a suitable combination of different distances and layer thicknesses in such a damping layer system can help to solve even demanding damping tasks.
  • Foamed volume-conductive plastic can also be used as an alternative to "solid" volume-conductive plastic.
  • this damping layer can also be applied as a spray foam on a metallic surface, which hardens after application.
  • a damping layer that is particularly easy to apply results when the damping layer is designed as a flexible film, which can also be equipped with self-adhesive properties.
  • a particularly broadband design of the damping effect results when the damping layer is corrugated and / or textured in relief. As a result, the angle dependence of the damping effect can be reduced.
  • FIG. 1 In the prior art, it is shown how an incident electromagnetic wave EM-E is reflected on a metallic surface MO, resulting in an outgoing (reflected) electromagnetic wave EM-A.
  • the electromagnetic waves EM-E, EM-A are visualized in the figures as arrows (vectors), the length the arrows (vectors) represent a measure of their energy (field strength).
  • the body with the metallic surface MO is a material of high electrical conductivity, resulting in that hardly a portion of the energy of the incident electromagnetic wave EM-E is converted into heat and thus the energy of the incident and the failing electromagnetic Waves EM-E, EM-A is almost identical. Due to the high conductivity, the incident electromagnetic wave EM-E hardly penetrates into the material with the metallic surface MO, but the electromagnetic wave EM-E is practically completely and without penetrating or even penetrating the material on the metallic surface MO reflected.
  • damping layer DS consists of a volume-conductive plastic (here: volume-conductive propylene or polypropylene) with a surface resistance in the range of 10 4 to 10 5 ohms (this value refers to a normalized measuring arrangement with ring electrode).
  • the outgoing (reflected) electromagnetic wave EM-A strictly consists both of a portion which is reflected in the area of the damping layer DS and of a portion which penetrates the damping layer DS, is reflected on the metallic surface MO, and finally again the damping layer DS penetrates and is emitted.
  • first distance spacers AH are provided in the gap between the metallic surface MO and the damping layer DS, which are placed either before the application of the damping layer DS on the metallic surface, or may already be formed on the damping layer DS.
  • advantageous embodiments of the damping layer DS concern on the one hand a layer system of several individual layers ("layers") of volume-conductive plastic with optionally arranged therebetween second distances and possibly corresponding spacers.
  • Further advantageous embodiments relate to a foamed design and embodiments with irregular surface or irregular layer thickness, for example by embossed foam or foils embossed.
  • Variants are also conceivable in which a metallic surface MO is sprayed with a hardening foam which adheres to the metallic surface MO and thereby ideally also forms an irregular surface.
  • Another alternative is the so-called “flocking" with adhesive particle accumulations.
  • customary graphites are added to the volume conductive plastics to achieve the electrical conductivity, it is advantageously also possible to add ferrite particles or metal particles alternatively or additionally.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
EP10006354A 2010-06-18 2010-06-18 Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques Withdrawn EP2398110A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10006354A EP2398110A1 (fr) 2010-06-18 2010-06-18 Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10006354A EP2398110A1 (fr) 2010-06-18 2010-06-18 Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques

Publications (1)

Publication Number Publication Date
EP2398110A1 true EP2398110A1 (fr) 2011-12-21

Family

ID=42563085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10006354A Withdrawn EP2398110A1 (fr) 2010-06-18 2010-06-18 Couche d'amortissement pour la réduction de la réflexion d'ondes électromagnétiques sur des surfaces métalliques

Country Status (1)

Country Link
EP (1) EP2398110A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165601A (en) * 1996-10-05 2000-12-26 Ten Kabushiki Kaisha Electromagnetic-wave absorber
JP2003060383A (ja) * 2001-08-16 2003-02-28 Daido Steel Co Ltd 電磁波吸収シート
EP1819211A1 (fr) * 2004-12-03 2007-08-15 Nitta Corporation Inhibiteur d'interference electromagnetique, dispositif d'antenne et appareil de communication electronique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6165601A (en) * 1996-10-05 2000-12-26 Ten Kabushiki Kaisha Electromagnetic-wave absorber
JP2003060383A (ja) * 2001-08-16 2003-02-28 Daido Steel Co Ltd 電磁波吸収シート
EP1819211A1 (fr) * 2004-12-03 2007-08-15 Nitta Corporation Inhibiteur d'interference electromagnetique, dispositif d'antenne et appareil de communication electronique

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